- Definitions|2
- Thesaurus|1.3k
- Abbreviations|0
150 entries under hard topic. ×
| tough nut to crack(expression, adjective, idiom, mean) | |
| unadaptable(resolute, rigid, inflexible, strict) | |
| uncontrite(adjective, tough, harsh, cruel) | |
| unemotional(adjective, mean, tough, harsh) | |
| ungracious(adjective, severe, sharp, nasty) | |
| unimpressible(adjective, mean, tough, harsh) | |
| unkind(adjective, animal, mean, severe) | |
| unrepenting(adjective, tough, harsh, cruel) | |
| wicked(adjective, severe, evil, sharp) | |
| abusive(adjective, severe, sharp, nasty) | |
| comfortless(adjective, severe, sharp, nasty) | |
| dense(adjective, strong, tough, sturdy) | |
| discourteous(adjective, severe, sharp, nasty) | |
| ferric(adjective, strong, tough, sturdy) | |
| ferrous(adjective, strong, tough, sturdy) | |
| frigid(adjective, mean, harsh, cold) | |
| hairy(adjective, severe, sharp, nasty) | |
| hard-and-fast(resolute, rigid, inflexible, strict) | |
| hatchetjob(adjective, mean, harsh, cold) | |
| killer instinct(expression, adjective, mean, harsh) |
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| APA | Smart Define. (2015). relentless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/relentless/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "relentless thesaurus" https://smartdefine.org/relentless/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, relentless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/relentless/thesaurus/synonyms>. |
| MLA | Smart Define. "relentless thesaurus" 24 June 2015. Web. 25 September 2026. <https://smartdefine.org/relentless/thesaurus/synonyms> |